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Home >> Toyota >> 2012 >> Highlander Limited, FWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning (Automatic) (Diagnostic Codes & Circuit Tests) (Except Hybrid) >> AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) >> DTC B1422/22: Compressor Lock Sensor Circuit >> Procedure

DTC B1422/22: Compressor Lock Sensor Circuit: Procedure

  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Use Techstream to check if the CAN communication system is functioning normally.

      OK

      CAN DTC is not output

    NG → See step   5 

    OK: Go to next step 

  2. INSPECT AIR CONDITIONING AMPLIFIER 
    1. Remove the air conditioning amplifier. Refer to REMOVAL - Step 6 with the connectors still connected.
      Fig 1: Inspecting Air Conditioning Amplifier
      GTY206551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the waveform of the connector.
      Fig 2: Identifying Connector Waveform
      GTY180394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Tool setting 200 mV/DIV., 10 ms./DIV.
      Vehicle condition Engine is running
      Air conditioning switch: ON
      Blower switch: LO

      Standard

      Tester Connection Condition Specified Condition
      D37-8 (LOCK) - D37-13 (SG-2) Engine is running
      Air conditioning switch: ON
      Blower switch: LO      		 Pulse generation

      Result

      Result Proceed to
      NG A
      OK (When troubleshooting according to PROBLEM SYMPTOMS TABLE) B
      OK (When troubleshooting according to DTC) C

    B → See step   6 

    C → See step   7 

    A: Go to next step 

  3. INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR) 
    1. Disconnect the connector from the air conditioning compressor.
      Fig 3: Checking Compressor And Magnetic Clutch (A/C Lock Sensor)
      GTY302514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      B66-1 (SSR+) - B66-2 (SSR-) 20°C (68°F) 160 to 320 Ω

    NG → See step   8 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR) 
    1. Disconnect the connector from the air conditioning amplifier.
      Fig 4: Checking Harness And Connector (A/C Amplifier - A/C Lock Sensor)
      GTY207462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.
      Fig 5: Checking Compressor & Magnetic Clutch A/C Lock Sensor
      GTY297878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Condition Specified Condition
      D37-8 (LOCK) - B66-1 (SSR+) Always Below 1 Ω
      D37-13 (SG-2) - B66-2 (SSR-) Always Below 1 Ω
      D37-8 (LOCK) - Body ground Always 10 kΩ or higher
      D37-13 (SG-2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  5. GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  6. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  7. REPLACE AIR CONDITIONING AMPLIFIER. Refer to  REMOVAL - Step 6 
  8. REPLACE COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR). Refer to  REMOVAL 
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